What's the ribbon for?

spl23

Well-known Member
This has been bugging me ever since I got an AVR750...

If you look through the ventilation slots on the top at the main heatsink, there seems to be a piece of cloth ribbon running across the front of the heatsink vanes, glued on at either side and, on mine, slightly torn in a couple of places.

I've worked in engineering for 25 years, and I cannot for the life of me think of any reason to stick a bit of ribbon on a heatsink! The only thing I can think is it is some part of the "mask of silence", but that seems pretty unlikely. Either that, or it is something that is designed to do something when the fans turn on.

Anyone got any bright ideas? I'm just curious!
 

sounddog

Well-known Member
Tying a girls hair?
 

Damian1978

Well-known Member
Can't recall seeing that on mine. Theres a ribbon cable to the right but that's not ripped
 

spl23

Well-known Member
Shine a torch down through the ventilation slots on the top, and you can see the ribbon quite easily - it runs along the front of the vanes on the main heatsink (so when you are looking down through the slots, you see the thin edge of the ribbon).

It's also visible on the internal photos on the areadvd.de review, so it's a standard feature!
 

Valvaholic

Standard Member
Mine is grey, 3/4" wide, and runs the entire width of the heatsink. Couple nicks in mine too. No clue what it's for...
 

Damian1978

Well-known Member
Just looked. Mine is similar. Looks like a black elasticated band across the heatsink. No nicks or breaks in mine though.
 

Damian1978

Well-known Member
Have you tried updating the firmware? :)

Strange. Thermal tape?? Who knows. Never heard the fans on mine or ever got it too hot so it could be normal
 

John7

Well-known Member
It's probably damping to reduce the effect of resonance ringing in the heatsink vanes
 

Damian1978

Well-known Member
Ahh. Yeah. That would make sense.

Mine sits on a granite block so hopefully its quite "dampened"
 

spl23

Well-known Member
It's probably damping to reduce the effect of resonance ringing in the heatsink vanes

I considered that, but it doesn't make sense - the mass of the ribbon is tiny compared to that of the heatsink, so it's going to do nothing at all for resonance.
 

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